Hi Mike,

You nearly slipped through the net there, didn't see this post.

Ok well, your requirements are not too taxing for any machine really if it's mostly plastics, aluminum, and engraving thou are slightly different.
Aluminum cutting requires a strong machine because of the higher cutting forces involved. Engraving requires a Stiff and accurate machine because of the tiny, tiny moves often involved, vibrations or any slop from the machine will affect the quality of work and life of tools.

Obviously to what degree depends on the quality of work you want to produce.? You'll see lots of cheap machines cutting aluminum and engraving on Youtube but very few tell or show the real truth. Which is the Finish is often poor, tool life is short, cycle times are massive because they have to go slow to compensate for the weak sloppy machine. They also don't tell you how it affects the machine and how it knocks seven bells out of them or the constant tweaking they have to do to keep it running.!

My advice is that if you want an all-round machine that can do most things in materials up to Aluminium and to a decent standard then don't buy a cheap machine like the Shapeko, work bee's or cheap Chinese offerings etc. The Heiz Z range are ok-ish but well overpriced IMO.
Unfortunately, I can't recommend any good ones at the lower price ranges and normally I would advise that you build your own or get one built by someone else like my self if you want a good machine. ( That's not me touting for work, it's just a fact, I don't need the work.)
This way you'll get a good machine at a fair price and if you build it your self you'll know it intimately plus build it to your exact requirements and budget.!

If not then you are entering a minefield of rubbish and rip off merchants, or be prepared to spend more £££ and go with more reputable companies who won't necessarily give you a better machine but should give you better service. (But not always.!!)

Regards holding 50 cartridges then you'll really need to make a fixture Jig to hold them easily and quickly so you might want to give that some thought.!! . . It will probably take you longer to load them than it will to cut them..Lol